Ford investigates potential problems with emissions, mpg reporting

Incorrect calculations may have been used to estimate fuel consumption.

Ford has launched an internal investigation into potential problems with its fuel-efficiency and emissions reporting.

The company may have been using the incorrect mathematical models to establish fuel consumption estimates that are submitted to the Environmental Protection Agency and California Air Resources Board for certification.

"In September, a handful of employees raised a concern through our Speak Up employee reporting channel regarding the analytical modeling that is part of our US fuel economy and emissions compliance process," Ford says.

The company has hired an outside firm to handle the investigation and and independent lab to conduct further validation testing.

"The investigation and potential concerns do not involve the use of defeat devices in our products," the company says. "At this time, there's been no determination that this affects Ford's fuel economy labels or emissions certifications."

The first vehicle under review is the 2019 Ranger, to be followed by additional vehicles that presumably used the same erroneous calculation.